Tailors
Coats and suits.
Yes they do.
Suits. The other suits are called clubs and hearts.
Calvin Klein does make formal attire. They make dress suits for men.
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The diamond suit is a 'minor' suit. Clubs is also a 'minor' suit. Spades and hearts are the 'Major' suits. They are called that because major suits give more points in the scoring than minor suits. It only takes a four-bid to make 'game' in hearts or spades, but you must bid five diamonds or clubs to make 'game'.
Because it sounds professional and the brand makers could not think of anything else for a name for the suits.
People that make jewelry are called jewelers
Bodysuits or snap-suits
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Plus Fours
People who make hats are known as 'Milliners' The industry itself is called 'Millonry'